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instance method
IO#tell
tell → integer
io.c
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static VALUE
rb_io_tell(VALUE io)
{
rb_io_t *fptr;
off_t pos;
GetOpenFile(io, fptr);
pos = io_tell(fptr);
if (pos < 0 && errno) rb_sys_fail_path(fptr->pathv);
pos -= fptr->rbuf.len;
return OFFT2NUM(pos);
}
Returns the current position (in bytes) in self (see Position):
Example
f = File.new('t.txt') f.tell # => 0 f.readline # => "This is line one.\n" f.tell # => 19